6.4 cummins build

I am mainly a 12v guy, but trying to get some clarification..., is a 6.7 or 5.9 head used for the 6.4? If a 5.9 head is used, then are the extra water jackets filled on the 6.7 block?If the 6.7 head is used, it brings up problems w/ the 6.7's blowing head gaskets, even w/ studs because of the extra water jackets or is it a bunch of bolonga???
Thanks gentlemen.
 
I know the 6.4 concept but I was looking on FB and there's a company that's building them I'm a completely different route. They are using 6.7 blocks and 6.7 cranks but sleeving the piston down to a 5.9 bore, not sure if they are using the .040" over piston or not. That kinda seems ass backwards. The biggest issue with the 6.7 cranks is the rod angle. Eliminating that is going with the 5.9 crank. So has anyone else heard of this odd ball 6.4 cummins build/setup?
 
How's the truck running man??

Any track times or new dyno numbers?


Also, Did Ashley calculate the compression ratio for the 6.4 build with custom pistons?? I'm curious if it is close to stock or a good bit lower.
 
Swole I haven't been able to make a full pass at the track yet been having a lot of Trans problems and the headgasket started leaking so I got to change it out before I can run it anymore fastest pass to date was 7.07 in 1/8
 
using ductile iron sleeves making it a 5.9 bore makes it almost indestructible . costly also.
 
Sleeving in itself to the a 5.9 bore doesn't get you to 6.4. There's another thread on this as well "somewhere else". When you do the math a std. 5.9 piston and 6.7 crank nets you 6.1L and a 0.040 5.9 piston get you to 6.2L. On the other hand a 41/8" bore does get you 6.4L. Hmmmm. I'm thinkin' some of what's lit the topic up this week might me including Darton sleeves, forged pistons, block filler, and a whole lot of machine work.
 
I have been trying to find info on a different approach to making a 6.4, it may have been covered somewhere else but have yet to find it. So could a person take a 5.9l block and bore it out then use high grade sleeves to have it the same bore as a 6.7l bore, then a person wouldn't have to deck the deck a huge amount? That would still make it a 6.4L?
 
I don't think there is enough material between the bores to do so. The 6.7 is a siamese block and the 5.9 isint.
 
Plus removing bore material weakens the entire block and will make it more prone to splitting in half.
 
Are the guys doing 4.25" bore using a 6.7 block then. I thought some of the racers were using those pistons?
 
Almost have to be 6.7 block based then pushing sleeves in to get the bore they are after, but a 4.25 bore is well over 6.4l
 
Thanks, you nailed exactly what they are doing. That whole thread was based on 6.7 .040" overbore pistons.
 
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